I have a CUBE connecting one CME and one Avaya IPOffice via SIP trunks. Calls from CME can establish the call, but fail when the user at IPOffice picks up the phone. 'debug ccsip message' shows:
the CUBE is sending 'BYE' because of
CSeq: 102 BYE
Calls from the Avaya to CME are working fine.
Any guidance to the problem will be appreciated.
Cause code 127 is not very helpful most of the time. It's a 'interworking error' which doesn't offer much insight into what is happening.
I would suggest running 'debug ccsip all' and look at the output before the BYE. It's a good debug and can explicitly tell you the problem a good portion of the time.
If you post the debugs, we can take a look.